## Rate of a Chemical Reaction – Class 12 | Chapter – 4 | Chemistry Short Notes Series PDF for NEET & JEE

Rate of a Chemical Reaction: The rate of a chemical reaction is a measure of how quickly reactants are converted into products. It is typically expressed as the change in concentration of one of the reactants or products over time. The rate of a reaction depends on a variety of factors, including the concentration of the reactants, temperature, pressure, and the presence of catalysts or inhibitors.

The rate of a chemical reaction can be determined experimentally by monitoring the concentration of reactants or products over time, and then using this data to calculate the rate of reaction. The rate of reaction can also be expressed as a mathematical equation, known as a rate law, which describes how the rate of the reaction depends on the concentrations of the reactants.

## How to Calculate Rate of a Chemical Reaction?

The rate of a chemical reaction can be calculated using experimental data and mathematical equations. Here are the general steps for calculating the rate of a chemical reaction:

• Determine the chemical equation for the reaction: Write the balanced chemical equation for the reaction, including the reactants and products.
• Choose a reactant or product to monitor: Select a reactant or product whose concentration can be easily measured over time.
• Conduct the experiment: Carry out the reaction in a controlled environment while monitoring the concentration of the chosen reactant or product at different time intervals.
• Calculate the change in concentration: Determine the change in concentration of the chosen reactant or product over time.
• Calculate the average rate: Divide the change in concentration by the time interval to obtain the average rate of the reaction.
• Calculate the instantaneous rate: Determine the instantaneous rate of the reaction by calculating the slope of a tangent to the concentration-time curve at a specific time point.
• Determine the rate law: Use the experimental data to determine the mathematical equation (rate law) that describes how the rate of the reaction depends on the concentrations of the reactants.

Overall, calculating the rate of a chemical reaction involves collecting experimental data and using it to determine the average and instantaneous rates of the reaction, as well as the rate law that describes the relationship between the rate and the concentrations of the reactants.

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